CEC-ICMC 2019 - Abstracts, Timetable and Presentations

M1Or2A-04: Effect of Grain Size, Flux Pinning, and High Critical Field in Ternary APC Nb3Sn Wires

Jul 22, 2019, 11:45 AM

15m

Level 6, Room 12-13

Contributed Oral Presentation M1Or2A - A15 Conductors

Speaker

Jacob Rochester (The Ohio State University)

Description

Nb₃Sn conductors have been made which incorporate ZrO₂ artificial pinning centers (APCs) that serve to refine the grain size of the superconducting material. Work on these wires has resulted in conductors which approach the FCC specification of J_c of 1500 A/mm² at 16 T and 4.2 K. Understanding the causes of high J_c at mid to high magnetic fields in these wires is crucial for developing an optimum conductor for next-generation particle accelerators. Reduced grain size has been demonstrated to increase J_c, due to the increased flux pinning at grain boundaries. In addition, ZrO₂ particles serve as point-like flux pinning centers, with a different behavior versus magnetic field. The relative contribution of these two factors on the J_c is evaluated. The effect of stoichiometry on the increased B_irr and B_c2 in ternary APC wires is also considered.

Presentation materials

ICMC2019_Rochester_APC_Presentation_vFinal.pdf